Drawing-pen.



- 110,854,585. PATENTBD MAY 21, 1907.

I wnwasszsw 0. G. MAYER.

DRAWING PEN.

APPLICATION FILED P317. 1007.

' \NVENTOR,

% ATTORNEY.

THE NORRIS FEi'ERs co., WAsl-mvcmrv. L c.

- pen having a releasable OTTO G. MAYER, OF STUTTGART, GERMANY.

DRAWING-PEN.

Specification of Letters Patent.

Patented May 21, 1907.

Application filed February 7, 1907. Serial No. 356,214.

To aZZ whom it may concern.-

Be it known that I, OTTO G. MAYER, a citizen of the German Empire,residing at Stuttgart, in the Kingdom of Wiirtemberg, Empire of Germany,have invented certain new and useful Improvements in Drawing-Pens; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention has for its object a drawing means for adjusting it to aprecise line and consists of a set screw the threaded shank of which isconveniently releasably mounted on the fixed blade of the drawing pen,in such a way, that after the release of this threaded shank the movablespring blade of the drawing pen moves far enough away from the fixedblade to admit of the drawing pen being easily cleaned, and afterreadjustment of the threaded pin or shank the thickness of line thendrawn is again precisely the same as before.

Several forms of construction of such releasable precise adjustingdevices, in drawing pens, are shown in Figures 1-12 of the accomp anyingdrawings In Figs. 1 and 2 an adjusting device is shown in two differentviews in which the double hook e of the threaded pin 0 is carriedthrough a slot f in the fixed blade a of the drawing pen, then turnedthrough 90and by means of its double hook engages in recesses 'i of thefixed tongue and in this position is pre vented turning. The threadedpin 0 passes through the movable blade 6 of the drawing pen and has aset nut g by means of which the movable spring blade I) may be adjustedrelative to the fixed blade a. On the front end of the threaded shank ca head a is formed by means of which the threaded shank 0,-may be turnedand brought out of engagement with the fixed blade at, in which positionin consequence of the spring action of the blade I), the threaded shankescapes from the fixed blade and the two blades lie so far apart thatthey may be conveniently cleaned. After the threaded pin has again beeninserted in the fixed blade a and its projections engaged behind thelatter, the pen describes a line of exactly the same thickness asbefore.

Figs. 3 and 4 of the drawings show on an enlarged scale the settingdevice according to Flgs. 1 and 2 in two different sections.

In the adjusting device shown in Figs. 5 and 6, in two views turned at90 to one another, which device is again shown on an enlarged scale intwo different sections in Figs. 7 and 8, in place of the head d on thethreaded pin 0, a counter-nut d is provided by means of which the nut 9may be fixed in known manner on the threaded pin 0. By compressing thetwo blades a and b the double hook e of the threaded pin may also bebrought out of engagement'with the recessesf of the blade a, and turned90, where by the two blades in consequence of the spring action of theone are automatically moved so far apart that they are convenientlyaccessible for the purposes of cleaning. After the re-insertion of thethreaded pin 0 in the fixed blade (1 the pen makes again exactly thesame thickness of line as before.

The adjusting device shown in Figs. 9 and 10 in elevation, and in Figs.11 and 12 in two different sections, on an enlarged scale, substantiallycoincides with the one shown in,

Figs. 1 and 2, only differing therefrom inasmuch as a single hook e isprovided on the threaded pin 0 instead of a double hook e, which singlehook on engaging the fixed blade a engages in a recess 72. of the same.The release of the threaded pin from engagement with the blade (1 takesplace by turning the pin through 180, or by the pin 0 having so muchplay in the movable blade Z), that it is not necessary to turn the pinwhich may be displaced at its point of engagement in the fixed blade ajust a suflicient amount to allow its hook e to come out of engagementin the recess h of that tongue.

It is evident that a large number of such adjusting devices may also bearranged which however must all be provided with the principal featureof the invention, viz: the arrangement for releasing the threaded pin afrom the fixed blade, in order after the re adjustment of the drawingpen, which has been opened for the purposes of being.

cleaned or the like, to maintain the same width of line as formerly. Itmay also be observed here that the threaded pin and set nut is alsoalways held in the movable blade even after its release from theengagement with the fixed blade, so that it is not liable to be lost.

I declare that what I claim is z- In a drawing pen, a fixed blade havinga slot therein, a movable spring blade, and a releasable mechanism forprecisely adjusting IIO said blades as desired, sueh releasable mech- Intestimony whereof I aflix my signature, 'anism comprising a threaded pinturnably in presence of two witnesses. mounted in the movable springblade and OTTO G MAYER provided With a set nut and with a hooked 5 endfor passing through the slot of the fixed Witnesses:

blade and engaging the latter to hold both HERMANN NOPPE, blades firmlytogether. ERNST ENTLESMANN.

